Frequency spectrum of ζ = sinI/ 2 exp(ıΩ) from a 10 Myr numerical orbital integration of (184) Dejopeja. The abscissa is the frequency in arcseconds per year, and the ordinate in amplitude of the quasiperiodic approximation Aexp [ ı(st + φ) ]. The principal spectral lines are labeled using the standard notation in planetary studies: (i) s is the proper frequency; (ii) s₆, s₇, and s₈ are the linear planetary frequencies.